Method of and apparatus



(No Model.) 7 I v TVMURPHY. METHOD OF AND APPARATUS FOR EQ-UALIZISG LINKS. No. 478,454.

Patented July 5, 1892.

BY Mr/ A TTORNE Y8 W/ TNE SSE S- 6% 0%? TN: Nomus versus co., mcro-uma, wnsmnatcm, a, c.

A UN T D STATES OFFICE.

THOMAS MURPHY, or sn-wiontnr, PENNSYLVANIA.

METHOD OF AND APPARAT UsF-on EQUALIZING LINKS.

- r 1 v SPECIFICATION forming part of Letters BatntNo. 478,454, dated July 5, 1892.

- Application filed November 23, 1891.. stir T all whom, it may concern:

Be it known that I, THOMAS MURPHY, of Sewickley, in the county of Allegheny and State of Pennsylvania, have invented a new and Improved Method of and Apparatus for jected to a heavy strain or sudden jerk.

, ufacture by hammering, welding,

The invention will be hereinafter described and claimed. In the accompanying drawings, in which similar letters of reference indicate corresponding parts, Figure 1 is a sectional side elevation of the device on the line 1 1 of Fig.

jars consisting of two engaged links, one fitted to slide on the other, so'that whenthe jars are lowered and the drill has engaged the rock the lower link remains stationary,

.while the upper link or jar'is caused to slide downwarda short distance farther to disengage its head from the head of'thelower link. Now in pulling up the jars the upper jar slides upward quickly and its head engages the head of the lower jar with a jerk, so as to pull the drilling-tool out of the rock. In case the two members or reins of the jars are unequal in length, caused in the process of man or otherwise, then the entire strain of the jerk comes on one of the members or reins and a break is unavoidable'and the drilling-tools are lost in the well. In order to'remcdy this invisible defect in the length of the members or reins of the jars and to prevent breaking of the latter, Isubject the manufactured links to heat in a suitable furnace and'at the same time apply power to the ends of the jars, so as to stretch the reins or members. By the heating and simultaneous gradual stretching of the jars the shorter rein or member expands and is lengthened to gradually catch up to "lNo. 412,732. (No model.)

the expansion and slower stretching of the larger rein or member, it being understood that the power applied for stretching is mostly expended on the shorter'member, and conseother one. As the members are heated, their particles readily yield to the power applied at the ends to strctclnas described. Vllen the length of the shorter member equals that of the other and the heating and stretching is continued, both members will stretch alike, or nearly so. .As soon as the members are of equal length, the heating'is discontinued, but

the jars are held in a stretched position until cooled sufiiciently for convenientremoval.

I do not limit myself to'the particular construction of the jars, as the method can be readily applied to links used for otherpurposes but of a similar construction.

As shown in the drawings, the jar Ais provided with the two links B and O, which are alike in constr'uctiomeach comprisingashank D, projecting from a cap E, connected by the two reins or members F and Fwith the head G, and thus completing the link. The head of one jar is fitted to slide between two reins of the other jar, as is plainly shown in the quently the latter is'stretched more than the v drawings. When the jars have been manufactured in the usual manner, they are placed into a furnace H of any approved construction, arranged so as to heat the jars, the latter being placed horizontally and their shanks extending through the end walls of the furnace. r v

The outer threaded'ends of the shanksD of the two jars B and O'pass-throughatransversely-extending bar I, on which abut the nuts I, screwing on' the'threaded shanks and against the said bar I. The latter rests with its outer ends on vertical standards or posts J, abutting againstthe ends of the furnace H, the said posts being reinforced by longitudinally-extending bars K, passing through the wall ofthe furnace and connecting oppositevly-arra'nged posts .7 with each other, as is plainly indicated in Fig. 2. p

Now it will be seen thatwhen the heat is applied to heat thetwo jars untilthe latter reach a welding heat then the operator. turns the nuts I so as to stretch the two jars in opposite directions, it being understood that the heads G of the two jars engage each other, as shown in the drawings. This heating and stretching process is continued until the reins F and F of each of the jars are of the same length. The heating is then discontinued, but the nuts I remain screwed up until the jars have cooled sufficiently to admit of convenient removal from the furnace I-I.

Having thus fully described my invention, I claim as new and desire to secure by Letters Patent- 1. The herein-described method of equalizing the lengths of the two sides of a link, which consists in subjecting it to the action of heat 15 and at the same time to a gradual strain until its sides or members are of equal lengths,

substantially as set forth.

THOMAS MURPHY.

Witnesses:

Tnno. G. HosTER, C. SEDGWICK. 

